Hand-held keratometer

Details Hand-held keratometer Hand-held keratometer

1981-11-30

1985-01-01

Henry, Jon W.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351212, A61B 310

Patent

active

044913982

ABSTRACT:
A hand-held keratometer is formed of a handle mounting a circular ring of transparent material having a roughened surface to collect incident light and project a circle of light for use in measuring roundness and, therefore, astigmatism of an eye while being held in the hand of a surgeon, the keratometer carrying indicia to permit the surgeon to radially locate the axis of astigmatism and determine the extent of astigmatism.

REFERENCES:
patent: 1944406 (1934-01-01), Crofton
patent: 4256385 (1981-03-01), Cohen et al.
patent: 4426141 (1984-01-01), Holcomb

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